Sighting attachment for levels.



0. 500mm. I SIGHTING ATTACHMENT FOR LEVELS.

APPLICATION HLED JAN- 25, I816.

Patented July 4, 1916.

UNITED STATES PATENT OFFICE.

CHRISTIAN BODMER, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE STANLEY RULE 86 LEVEL COMPANY, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

SIGHTING- ATTACHMENT FOR LEVELS.

Specification of Letters Patent.

Patented July 4, 1916.

Application filed January 25, 1916. Serial No. 74,262.

To all whom it may concern:

Be it known that I, CHRISTLAN BODMER, a citizen of the United States of America, residing at New Britain, Connecticut, have invented a new and useful Sighting Attachment for Levels, of which the following is a specification.

My present invention is a sighting attachment for levels, the objects of the invention being to provide an accurate and efficient device of this character which will be inexpensive and which can be used in any situation required.

Another object is to so construct the sight that it can be readily and accurately machined and to brace the sight against injury by hard usage.

Another object is to simplify and facilitate the mounting of the sighting wires.

In the accomplishment of these various objects I construct the sight with a base portion arranged to rest on top of the stock of a level, a transversely extending bar at the forward end of said base carrying the sighting means and side portions dependent from the ends of said cross bar carrying the clamping means for engagement with the sides of the level stock. This construction leaves the forward face of the sight plane and free of any projections, so'that the sight may be moved up into close proximity with the eye or other object. The sighting means is usually in the form of an apertured lug rising from the transversely extending bar and a feature of such sighting means is the provision of an annular flange surrounding said sighting aperture. Crossed wires are usually employed on the rear sight and another feature of the invention resides in the securing of th'ese sighting wires in place by mounting them in slots in the annular flange and striking integral holding lugs from the material of said flange over the top of said sighting wires.

Various other features and details of construction will appear as the specification proceeds, attention being directed to the accompanying drawing, wherein is' represented a practical and preferred form of the invention.

. In this drawing: Figure 1 is a perspective view illustrating the application of the invention to the top of the level. Fig. 2 is a plan view of the rear sight. F ig.- 3 is a front View of the same showing only the bar.

first cross wire mounted in place. Fig. l is a detail perspective view of. the mounting for the cross wires.

In the illustration the front sight is designated 5 and the rear sight is designated 6, the two sights being indicated in the position they usually occupy when applied to the stock 7 of a level. Except for the character of the sighting means, the two sights are similar in construction, consisting in general of a fiat supporting base 10 designed to rest on top of the level, a bar 11 at the forward end of said base extending transversely across the top of the level, and sides 12 and 13 dependent from the ends of said cross The side member 12 carries at its lower end a rearwardly extending clamping flange 14 for engagement with one side of the level stock and the otherside member 13 carries a rearwardly extending portion 15 in which is engaged a screw 16 or other suitable clamping device. The clamping screw is preferably disposed in a plane between the ends of the clamping flange 14, as indicated by the dotted lines 17 in Fig. 2, whereby the effect of a three-point clamp is secured.

The forward base of the sight is formed plane and free of projections as clearly illustrated in Figs. 1 and 2. This enables the sight being brought clear to the end of the level into close proximity to the eye. This also is of great advantage in the machining of the instrument, since the front of the sight can be machined at a single operation. Another advantage of this construction is that the possibility of placing the sight wrongly'is to a large extent eliminated, because in mounting the sights on the level they are simply placed thereon so as to both face in the same direction, whereupon the side gaging flanges 14E .of both sights will be engaged with the same face of the level stock. r

The sight is made rigid and braced against distortion by making it substantially L aperture 22, crossed by the wires 23 and 24-. Surrounding these sighting apertures are the annular flanges 26, forming rims to said apertures. The vertical sighting wire 23 is seated in diametrically opposite slots 25 formed in the annular flange 2.6 surrounding the sighting aperture and the horizontal cross wire 24 is in a similar way seated in slots 27 formed in the flange 26 at diametrically opposite points and in a plane at right angle to the plane of slots 25 for the vertical cross wire. The slots for the first wire are preferably formed somewhat deeper than the slots for the second wire so as to permit the second wire to overlie the first wire Without substantially bending the wire. The cross wires are secured in their respective seats by integral holding lugs 29 struck from the flange at the side of the slots therein and bent down over the tops of the wires. This construction securely fastens the sighting wires in position without the need for any separate fastenings.

The base portion 10 of the sights are machined level and constitute bearing faces resting on the top of the level stock. The positions of the peep hole in the front sight and the horizontal slots in the rear sight are determined in each instance from these bearing faces. Thus the peep hole is formed on the front sight at a predetermined distance above the bearing face of that sight and the horizontal slots for the cross Wire are formed in the rear sight at an equal distance above the base of that sight. Similarly the clamping flanges 14 on the sides of the sights are machined true and square and constitute bearing faces from which the positions of the peep hole and the vertical cross Wire are determined, the peep hole being located a predetermined distance to the side of the side bearing face of the front sight and the slots for the vertical cross wire be ing located the same distance from the side bearing face of the rear sight. In this way the sighting means of both sights are made to correspond exactly and the instrument is made capable therefore of accurate and eflicient Work. The construction also has the advantages of simplicity and inexpensiveness of cost.

lVhat I claim is:

1. In a sighting attachment for levels, a

sight having a sighting aperture and an an;

nular flange surrounding said aperture prov1ded with slots in the face of said flange at diametrically opposite points, a sighting wire seated in said slots and integral holding lugs struck from said flange at the sides of the slots therein over the top of said sighting wire and thereby confining said wire in the slots without the aid of separate fastenings.

2. In a sighting attachment for levels, a sight having a sighting aperture and an annular flange surrounding said aperture provided with slots in the face of said flange at diametrically opposite points, a second set .of diametrically opposite slots in the face of said flange at right angles to the first slots, and of greater depth than said first slots, crossed sighting wires in said sets of slots and integral holding lugs on the flange at the sides of said slots engaged over the tops of the sighting wires seated therein.

3. In a sighting attachment for levels, a sight arched to fit down over the upper edge of a level, a base lug extending rearwardly from the central portion of said arch and clamping lugs extending rearwardly from the sides of said arch, the forward face of said arch being plane and free of projec tions whereby said sight may be brought as close as need be to the eye of the user.

45. A sighting attachment comprising a base arranged to rest on top of a level, a transversely extending bar at the forward end of said base, sighting means carried by said transversely extending bar, dependent sides at the ends of said transverse bar arranged to embrace the sides of a level, said transversely extending bar and dependent sides being free of any forwardly extending projection whereby said sight may be brought into close proximity With the eye of the user and rearwardly extending clamping lugs carried by said dependent sides. l

5. A sighting attachment comprising a flat support-ing base arranged to rest on top of a level stock, a transversely extending bar at the forward end of said supporting base, sides dependent from the ends of said transverse bar, an upstanding sighting lug carried by said transverse bar, said sighting lug, transverse bar and dependent sides having a plane forward face and said transverse bar and sides having a rearwardly extending bracing flange and clamping means carried by said sides.

CHRISTIAN BODMER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner cf Patents, Washington, D. G. 

